I'm very new to Prometheus and I am playin with it to see how it works.
According to a conversation I saw this problem should be fixed since version 0.16.
However I'm having it in version 0.21.
My simple alertmanager.yml:
global:
smtp_require_tls: false
route:
group_by: [Alertname]
# Send all notifications to me.
receiver: email-me
receivers:
- name: email-me
email_configs: